基于地球化学块体概念的中国锡资源潜力评价

Evaluation of China's tin resources potential based on the geochemical block concept

本文详细介绍了根据地球化学块体的概念、利用中国区域化探扫面的成果对中国锡资源潜力评价的方法技术;给出了金属供应量、地球化学块体成矿率、资源量和潜在资源量的计算公式,并引入了校正系数来修正根据水系沉积物计算的地球化学块体中的金属供应量;描述了中国锡地球化学块体的空间分布特征,分析了这些地球化学块体与地质体和已知锡矿床的空间对应关系;确定了中国锡在8μg/g、10μg/g含量级次的地球化学块体成矿率为0.205%和0.208%。同时根据在中国大陆所圈定的锡地球化学块体的分布及其特征计算出中国锡的潜在资源量为1609万t和1406万t。

This paper introduces in detail the method of assessing China's tin resources potential by using the geochemical block concept and the results of RGNR. It gives the calculation formulas for determination of the metal endowment, geochemical block mineralization coefficient, resource and potential resource. And a correction coefficient is used in calculating the metal endowment in geochemical blocks according to the metal content in stream sediments. The paper also describes the characteristics of the spatial distribution of China's Sn geochemical blocks and analyzes the spatial relationships of these blocks with geological bodied and known Sn deposits. The Sn geochemical block mineralization coefficients at the 8×10-6 and 10×10-6 concentration levels in China are 0.205% and 0.208% respectively. According to the distribution and features of the Sn geochemical blocks outlined on the continent of China and by using the two mineralization coefficients, China's potential Sn resources are estimated to be about 16.09 million tons and 14.06 million tons respectively.